Unlock instant, AI-driven research and patent intelligence for your innovation.

Fan flutter suppression system

a technology of fan blades and dampers, which is applied in the direction of mechanical equipment, machines/engines, transportation and packaging, etc., can solve the problems of aeromechanical instability, detrimental to the life of the fan blade, and the fan blade flutter

Active Publication Date: 2019-09-24
RTX CORP
View PDF67 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a flutter damper that can absorb the energy of a racing fan's flight. The damper contains an open-celled foam chamber filled with gas that resonates with the frequency ranges associated with fan flutter modes. The damper can be made with metal or non-metal materials, and can have gas passages at different depths. The damper can be used in a gas turbine propulsion system and can be fixed to a surface exposed to the gas flow. The technical effect of this patent is to provide an effective way to reduce the noise and vibration of gas turbine engines.

Problems solved by technology

Fan flutter is an aeromechanical instability detrimental to the life of a fan blade.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fan flutter suppression system
  • Fan flutter suppression system
  • Fan flutter suppression system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029]A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.

[0030]FIG. 1 schematically illustrates a gas turbine engine 20. The gas turbine engine 20 is disclosed herein as a two-spool turbofan that generally incorporates a fan section 22, a compressor section 24, a combustor section 26 and a turbine section 28. Alternative engines might include an augmentor section (not shown) among other systems or features. The fan section 22 drives air along a bypass flow path B in a bypass duct, while the compressor section 24 drives air along a core flow path C for compression and communication into the combustor section 26 then expansion through the turbine section 28. Although depicted as a two-spool turbofan gas turbine engine in the disclosed non-limiting embodiment, it should be understood that the concepts described herein are not limited to use with two-spool...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A flutter damper is disclosed, which includes a chamber configured to fluidly communicate with a gas flow, the chamber being filled with an open celled foam bulk damper, and wherein the chamber is configured for peak acoustical energy absorption at a frequency range that is associated with one or more fan flutter modes.

Description

BACKGROUND[0001]Exemplary embodiments pertain to flutter dampers in gas turbine propulsion systems and, more particularly, to flutter dampers in nacelle inlet structures.[0002]Geared turbofan architectures, allow for high bypass ratio turbofans, enabling the use of low pressure ratio fans, which may be more susceptible to fan flutter than high pressure ratio fans. Fan flutter is an aeromechanical instability detrimental to the life of a fan blade.[0003]Accordingly, there is a need for a flutter damper which, by absorbing the acoustic energy associated with the flutter structural mode, may prevent the fan from fluttering, and which may be integrated into the reduced available space in an optimized propulsion system.BRIEF DESCRIPTION[0004]Disclosed is a flutter damper, including a chamber configured to fluidly communicate with a gas flow, the chamber being filled with an open celled foam bulk damper, and wherein the chamber is configured for peak acoustical energy absorption at a freq...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): F02C7/045F02K1/82B64D33/02
CPCF02K1/827F02C7/045F05D2260/96Y02T50/672F05D2260/963B64D2033/0206Y02T50/60
Inventor SIDELKOVSKIY, DMITRIY B.MORIN, BRUCE L.ANDERSON, DAVID A.
Owner RTX CORP